Specific gravity: 6.59 calculated
Colour: Light grey, bluish grey to white
Common impurities: S
Volcanic igneous environments
At Sierra de Umango, Villa Castelli, General Lamadrid department, La Rioja Province, Argentina, athabascaite is associated with umangite and berzelianite (HOM).
At the type locality, the Martin Lake mine, Beaverlodge Lake area, Saskatchewan, Canada, athabascaite occurs as lath-shaped inclusions in umangite and as stringers and veinlets in hematite-stained carbonate vein material in basalt (CM 10.207-215). Associated minerals include uraninite, umangite, tyrrellite, silver, quartz, pyrite, klockmannite, hematite, feldspars, eucairite, eskebornite, copper, clausthalite, calcite, berzelianite and baryte (HOM).
At Petrovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic, athabascaite is associated with berzelianite, eucairite, crookesite, tyrrellite, ferroselite, bukovite, krut'aite, calcite and dolomite (HOM).
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